David eynon



@geiten tartes @stent @frn D`AVID EYNON., OF-RI'CHMOND, VIRGINIA.

' l Letters Pan1v..69,7s6,`dad october 15, 1867.

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TO A.IiL WIIOM IT'MAY GONCERNz` Be it known that LIDAVID EYNON, of Richmond, in'the county-of Henrico, and State of Virginia, have invented a. new and useful Method ofSlotting Railroad Chairs, of which the following is a full, clear, and exact description, reference being had"'to the accompanying drawings, which make part of this speciiicatipn, and in which- Y l Figure 1 representen. front view of so much of my improved machine as 'is vnecessary to illustrate my invention, and i Figure 2a vertical transverse sectionthrough the same, at the line a; a: of fig. 1.

VIn'sltting rtiiiddhairs previous to the date of my invention, two methods have been employed; In one the slot was cut by successive strokes of a slotting chisel-from the outer side ofthe chair, inwards; whilein the other, a mandrel, having holes corresponding withcthe slots to be' out, was placed inside the chair, and the slots punched from the outside,vinward. Both of these methods are objectionable, as by them a burr is left inside the chair, which has to be removed by a chisel before the raii caribe-inserted.

It is the object of my invention lto obviate this objection, and t-o this endomy improvement consists in a novel method of slottng railroad chairs by cutting the slots with a hooked cutter, which works from the inside outward, and cuts the slot at a single'strckei To carry out my invention, I mount a cam-shaft, B, or other suitable driving power, in a stout frame, A, and rotate it in asuitable manner. The cam imparts a vertical, reciprocating movement to a pitman, C, controlled by proper guides D, and having a hooked cutter, E, attached to it by a socket-joint, e, and working in a slot in the diel F.'

In operation, the chair is placed upside down over thedie, and the cutter inserted insidethe lip; the cuttcr is then depressed by the rotation ofthe cam-shaft, and forced through the lip ofthe chair, cutting the slot from the inside outward at a single stroke, and leaving the burr, if any, on the outer side.

The simplicity of this machine, and the rapidity with which it can be operated, render it of great utility.

I have shown and described one cutter only, but in practice usually employ two, as thatis the number of slots usually cut in each lip. It is, however, obvious that several cutters may be combined in one frame. It is also obvious that the mode cf driving'-the cutter might be modified in various ways without departing from the spirit of my invention.

Having thus shown, one practical way of 4carryingout my invention, what I claim, is.-

The method herein described of clotting railroad chairs.

I also claim the hooked cutter, constructed as described.'

, DAVID EYNQN.

Witnesses:

J. E. TANNER, E. B. Gooxn. 

